/*
 * ProgressGlassPane.java
 *
 *
 *  Copyright (C) 2007 COMP5425 Multimedia Storage, Retrieval and Delivery
 *  The School of Information Technology
 *  The University of Sydney
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */

package usyd.comp5425.ui;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JComponent;

/**
 *
 * @author Yuezhong Zhang  SID:305275631
 */
public class ProgressGlassPane extends JComponent implements MouseListener{
    
    protected Area[]  ticker     = null;
    protected Thread  animation  = null;
    protected boolean started    = false;
    protected int     alphaLevel = 0;
    protected int     rampDelay  = 300;
    protected float   shield     = 0.70f;
    protected String  text       = "";
    protected int     barsCount  = 14;
    protected float   fps        = 15.0f;
    
    protected RenderingHints hints = null;
    
    
    public ProgressGlassPane()
    
    {
        this("");
    }
    
    
    public ProgressGlassPane(String text)
    
    {
        this(text, 14);
    }
    
    
    public ProgressGlassPane(String text, int barsCount)
    
    {
        this(text, barsCount, 0.70f);
    }
    
    
    public ProgressGlassPane(String text, int barsCount, float shield)
    
    {
        this(text, barsCount, shield, 15.0f);
    }
    
    
    public ProgressGlassPane(String text, int barsCount, float shield, float fps)
    
    {
        this(text, barsCount, shield, fps, 300);
    }
    
    
    public ProgressGlassPane(String text, int barsCount, float shield, float fps, int rampDelay)
    
    {
        this.text 	   = text;
        this.rampDelay = rampDelay >= 0 ? rampDelay : 0;
        this.shield    = shield >= 0.0f ? shield : 0.0f;
        this.fps       = fps > 0.0f ? fps : 15.0f;
        this.barsCount = barsCount > 0 ? barsCount : 14;
        
        this.hints = new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        this.hints.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        this.hints.put(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
    }
    
    
    public void setText(String text)
    
    {
        repaint();
        this.text = text;
    }
    
    
    public String getText()
    
    {
        return text;
    }
    
    
    public void start()
    
    {
        // addMouseListener(this);
        setVisible(true);
        ticker = buildTicker();
        animation = new Thread(new Animator(true));
        animation.start();
    }
    
    
    public void stop()
    
    {
        if (animation != null) {
            animation.interrupt();
            animation = null;
            animation = new Thread(new Animator(false));
            animation.start();
        }
        setVisible(false);
    }
    
    
    public void interrupt()
    
    {
        if (animation != null) {
            animation.interrupt();
            animation = null;
            
            removeMouseListener(this);
            setVisible(false);
        }
    }
    
    
    public void paintComponent(Graphics g)
    
    {
        if (started) {
            int width  = getWidth();
            int height = getHeight();
            
            double maxY = 0.0;
            
            Graphics2D g2 = (Graphics2D) g;
            g2.setRenderingHints(hints);
            
            g2.setColor(new Color(255, 255, 255, (int) (alphaLevel * shield)));
            g2.fillRect(0, 0, getWidth(), getHeight());
            
            for (int i = 0; i < ticker.length; i++) {
                int channel = 224 - 128 / (i + 1);
                g2.setColor(new Color(channel, channel, channel, alphaLevel));
                g2.fill(ticker[i]);
                
                Rectangle2D bounds = ticker[i].getBounds2D();
                if (bounds.getMaxY() > maxY)
                    maxY = bounds.getMaxY();
            }
            
            if (text != null && text.length() > 0) {
                FontRenderContext context = g2.getFontRenderContext();
                TextLayout layout = new TextLayout(text, getFont(), context);
                Rectangle2D bounds = layout.getBounds();
                g2.setColor(getForeground());
                layout.draw(g2, (float) (width - bounds.getWidth()) / 2,
                        (float) (maxY + layout.getLeading() + 2 * layout.getAscent()));
            }
        }
    }
    
    
    private Area[] buildTicker()
    
    {
        Area[] ticker = new Area[barsCount];
        Point2D.Double center = new Point2D.Double((double) getWidth() / 2, (double) getHeight() / 2);
        double fixedAngle = 2.0 * Math.PI / ((double) barsCount);
        
        for (double i = 0.0; i < (double) barsCount; i++) {
            Area primitive = buildPrimitive();
            
            AffineTransform toCenter = AffineTransform.getTranslateInstance(center.getX(), center.getY());
            AffineTransform toBorder = AffineTransform.getTranslateInstance(45.0, -6.0);
            AffineTransform toCircle = AffineTransform.getRotateInstance(-i * fixedAngle, center.getX(), center.getY());
            
            AffineTransform toWheel = new AffineTransform();
            toWheel.concatenate(toCenter);
            toWheel.concatenate(toBorder);
            
            primitive.transform(toWheel);
            primitive.transform(toCircle);
            
            ticker[(int) i] = primitive;
        }
        
        return ticker;
    }
    
    
    private Area buildPrimitive()
    
    {
        Rectangle2D.Double body = new Rectangle2D.Double(6, 0, 30, 12);
        Ellipse2D.Double   head = new Ellipse2D.Double(0, 0, 12, 12);
        Ellipse2D.Double   tail = new Ellipse2D.Double(30, 0, 12, 12);
        
        Area tick = new Area(body);
        tick.add(new Area(head));
        tick.add(new Area(tail));
        
        return tick;
    }
    
    
    protected class Animator implements Runnable
            
    {
        private boolean rampUp = true;
        
        
        protected Animator(boolean rampUp)
        
        {
            this.rampUp = rampUp;
        }
        
        
        public void run()
        
        {
            Point2D.Double center = new Point2D.Double((double) getWidth() / 2, (double) getHeight() / 2);
            double fixedIncrement = 2.0 * Math.PI / ((double) barsCount);
            AffineTransform toCircle = AffineTransform.getRotateInstance(fixedIncrement, center.getX(), center.getY());
            
            long start = System.currentTimeMillis();
            if (rampDelay == 0)
                alphaLevel = rampUp ? 255 : 0;
            
            started = true;
            boolean inRamp = rampUp;
            
            while (!Thread.interrupted()) {
                if (!inRamp) {
                    for (int i = 0; i < ticker.length; i++)
                        ticker[i].transform(toCircle);
                }
                
                repaint();
                
                if (rampUp) {
                    if (alphaLevel < 255) {
                        alphaLevel = (int) (255 * (System.currentTimeMillis() - start) / rampDelay);
                        if (alphaLevel >= 255) {
                            alphaLevel = 255;
                            inRamp = false;
                        }
                    }
                } else if (alphaLevel > 0) {
                    alphaLevel = (int) (255 - (255 * (System.currentTimeMillis() - start) / rampDelay));
                    if (alphaLevel <= 0) {
                        alphaLevel = 0;
                        break;
                    }
                }
                
                try {
                    Thread.sleep(inRamp ? 10 : (int) (1000 / fps));
                }
                
                catch (InterruptedException ie) {
                    
                    break;
                }
                Thread.yield();
            }
            
            if (!rampUp) {
                started = false;
                repaint();
                
                setVisible(false);
                removeMouseListener(ProgressGlassPane.this);
            }
        }
    }
    
    
    public void mouseClicked(MouseEvent e) {
        
    }
    
    
    public void mousePressed(MouseEvent e) {
        
    }
    
    
    public void mouseReleased(MouseEvent e) {
        
    }
    
    
    public void mouseEntered(MouseEvent e) {
        
    }
    
    
    public void mouseExited(MouseEvent e) {
        
    }
}
